Reset invalid pio_numiotasks

Without this change if the stride is valid but numiotasks is
invalid, pio_numiotasks is not reset. The default value of
pio_numiotasks (-99) in component namelists is not reset
as expected.

The corresponding issue in ESMCI/cime is Issue #1372

[NML]

scripts/lib/CIME/case_setup.py

@@ -226,9 +226,9 @@ def adjust_pio_layout(case, new_pio_stride):
         if pio_stride != new_stride:
             logger.info("Resetting  PIO_STRIDE_%s to %s"%(comp, new_stride))
             case.set_value("PIO_STRIDE_%s"%comp, new_stride)
-            if pio_numtasks != new_numtasks:
-                logger.info("Resetting  PIO_NUMTASKS_%s to %s"%(comp, new_numtasks))
-                case.set_value("PIO_NUMTASKS_%s"%comp, new_numtasks)
+        if pio_numtasks != new_numtasks:
+            logger.info("Resetting  PIO_NUMTASKS_%s to %s"%(comp, new_numtasks))
+            case.set_value("PIO_NUMTASKS_%s"%comp, new_numtasks)
 
 
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